De novo biosynthesis of 2′-fucosyllactose in a metabolically engineered Escherichia coli using a novel ɑ1, 2-fucosyltransferase from Azospirillum lipoferum. (April 2023) - Chen, Yihan
Graphical abstract: Highlights: A novel ɑ 1, 2-fucosyltransferase was used for 2′-fucosyllactose production. The yield of 2′-fucosyllactose was enhanced by introducing SAMT into strains. Only 2′-fucosyllactose can be produced by SAMT -based strains. The maximum of 2′-fucosyllactose reached 112.56 g/L by fed-batch cultivation. Abstract: Human milk oligosaccharides are complex, indigestible oligosaccharides that provide ideal nutrition for infant development. Here, 2′-fucosyllactose was efficiently produced in Escherichia coli by using a biosynthetic pathway. For this, both lacZ and wcaJ (encoding β -galactosidase and UDP-glucose lipid carrier transferase, respectively) were deleted to enhance the 2′-fucosyllactose biosynthesis. To further enhance 2′-fucosyllactose production, SAMT from Azospirillum lipoferum was inserted into the chromosome of the engineered strain, and the native promoter was replaced with a strong constitutive promoter (PJ23119 ). The titer of 2′-fucosyllactose was increased to 8.03 g/L by introducing the regulators rcsA and rcsB into the recombinant strains. Compared to wbgL -based strains, only 2′-fucosyllactose was produced in SAMT -based strains without other by-products. Finally, the highest titer of 2′-fucosyllactose reached 112.56 g/L in a 5 L bioreactor by fed-batch cultivation, with a productivity of 1.10 g/L/h and a yield of 0.98 mol/mol lactose, indicating a strong potential in industrial production.